Electron paramagnetic resonance spectra of CeO2 catalyst for CO oxidation

Electron paramagnetic resonance spectra of CeO2 catalyst for CO oxidation

The EPR spectra of freshly prepared CeO2 samples as well as of samples used as a catalyst in the oxidation of CO to CO2 are reported. Attribution of these patterns to oxygen species O2-, O2, O-, or to Ce3+ ions is discussed and dynamic phenomena involving these species are described. Bottlenecked sy...

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Veröffentlicht in:Journal of materials science 1996-12, Vol.31 (23), p.6333-6338
Hauptverfasser: Oliva, C., Termignone, G., Vatti, F. P., Forni, L., Vishniakov, A. V.
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container_end_page 6338
container_issue 23
container_start_page 6333
container_title Journal of materials science
container_volume 31
creator Oliva, C.
Termignone, G.
Vatti, F. P.
Forni, L.
Vishniakov, A. V.
description The EPR spectra of freshly prepared CeO2 samples as well as of samples used as a catalyst in the oxidation of CO to CO2 are reported. Attribution of these patterns to oxygen species O2-, O2, O-, or to Ce3+ ions is discussed and dynamic phenomena involving these species are described. Bottlenecked systems between conduction electrons and Ce3+ ions are invoked to explain the observation of the Ce3+ EPR spectrum up to temperatures of about 370 K. Oxygen-deficient systems are obtained when the sample is used as a catalyst for CO oxidation in the presence of pyrex or quartz powder as a diluent, showing that the latter can play some role in stabilising such species. 26 refs.
doi_str_mv 10.1007/BF00354457
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title Electron paramagnetic resonance spectra of CeO2 catalyst for CO oxidation
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